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Articles 31 - 60 of 349
Full-Text Articles in Environmental Sciences
U.S. Drought Monitor, October 9, 2012, Matthew Rosencrans
U.S. Drought Monitor, October 9, 2012, Matthew Rosencrans
United States Agricultural Commodities in Drought Archive
Drought map of U.S. for October 9, 2012 (10/9/12) plus: U.S. crop areas experiencing drought (map), Approximate percentage of crop located in drought, by state (bar graph), Percent of crop area located in drought, past 52 weeks (line graph) for: Hay, Cattle, Winter wheat.
U.S. Drought Monitor, October 2, 2012, Anthony Artusa
U.S. Drought Monitor, October 2, 2012, Anthony Artusa
United States Agricultural Commodities in Drought Archive
Drought map of U.S. for October 2, 2012 (10/2/2012) plus: U.S. crop areas experiencing drought (map), Approximate percentage of crop located in drought, by state (bar graph), Percent of crop area located in drought, past 52 weeks (line graph) for: Hay, Cattle, Winter wheat.
Impacts Of Climate Change On The Surface Water Balance Of The Central United States, 1984-2007, Bo Dong
Impacts Of Climate Change On The Surface Water Balance Of The Central United States, 1984-2007, Bo Dong
School of Natural Resources: Dissertations, Theses, and Student Research
The climate system and the hydrologic cycle are strongly connected with each other. Understanding the interactions between these two systems is important, since variations in climate can trigger extensive changes in the hydrologic cycle, with significant impacts on agriculture, ecosystems, and society. Observations over the central U.S. in recent decades show numerous changes in climatic variables. This includes decreases in cloud cover and wind speed, increases in air temperature, and seasonal shifts in precipitation rate and rain/snow fraction. To assess the impacts of these variations in climate on the regional water cycle, a terrestrial ecosystem/land surface hydrologic model (Agro-IBIS) is …
Water Current, Volume 44, No. 4, Fall 2012
Water Current, Volume 44, No. 4, Fall 2012
Water Current Newsletter
UNL Research Team Giving Irrigators New Management Arsenal
Free Public Water Lectures Begin Jan. 16, Continue Through April
Meet the Faculty: P. Stephen Baenziger, Ph.D., Arthur I. Zygielbaum, Ph.D.
From the Interim Director: International Travels and Local Events Highlight
Green Industry Group Receives Instruction on Water Savings Techniques
A Physicist in the Plant Kingdom: Gitelson's Work Honored
The Groundwater Foundation
Making Every Drop Count: UNL Extension using Technology, Education to Conserve Water and Save Dollars
Williamson Named 2012 Kremer Recipient
Tadesse Advances Ethiopian Water, Food Security Projects
Water Symposium and Water Law Conference
Mapping Water Consumption in Agriculture
2013 Water …
A Geospatial Modeling Framework For Assessing Biofuels-Related Land-Use And Land-Cover Change, Ruopu Li, Qingfeng (Gene) Guan, James W. Merchant
A Geospatial Modeling Framework For Assessing Biofuels-Related Land-Use And Land-Cover Change, Ruopu Li, Qingfeng (Gene) Guan, James W. Merchant
School of Natural Resources: Faculty Publications
With the increasing biofuel demands in recent years, the cultivated lands for biofuel crops, i.e., corn and soybeans, the major sources of ethanol and biodiesel, have been greatly expanding in the northern Great Plains states of the United States. Simulating the spatio-temporal dynamics of biofuel croplands can provide critical information required for assessing the impacts of land-use change on wildlife conservation and water quality. But, yearly agricultural practices such as crop rotations often complicate the spatially explicit modeling of specific crops’ expansion. Our research focused on developing a geospatial modeling framework that is able to distinguish long-term, regional changes in …
Using Slow-Release Permanganate Candles To Remove Tce From A Low Permeable Aquifer At A Former Landfill, Mark D. Christenson, Ann Kambhu, Steve D. Comfort
Using Slow-Release Permanganate Candles To Remove Tce From A Low Permeable Aquifer At A Former Landfill, Mark D. Christenson, Ann Kambhu, Steve D. Comfort
School of Natural Resources: Faculty Publications
Past disposal of industrial solvents into unregulated landfills is a significant source of groundwater contamination. In 2009, we began investigating a former unregulated landfill with known trichloroethene (TCE) contamination. Our objective was to pinpoint the location of the plume and treat the TCE using in situ chemical oxidation (ISCO). We accomplished this by using electrical resistivity imaging (ERI) to survey the landfill and map the subsurface lithology. We then used the ERI survey maps to guide direct push groundwater sampling. A TCE plume (100-600 µg L-1) was identified in a low permeable silty-clay aquifer (Kh = 0.5 …
Droughtscape- Fall 2012, National Drought Mitigation Center
Droughtscape- Fall 2012, National Drought Mitigation Center
Droughtscape, Quarterly Newsletter of NDMC, 2007-
CONTENTS
Director’s report ....................... 1
Updated resources ................... 1
Drought outlook and review... 2
2012 and past droughters..... 4
Summer impacts summary.... 6
Urban planners and drought..... 9
USDM wins CLEAN seal... 10
Meixiu Yu's Chinese SPEI... 11
Ethiopian project..... 12
Mexican VegDRI.... 13
Drought monitor sculpture.... 14
Using The Internet To Understand Angler Behavior In The Information Age, Dustin R. Martin, Brenda M. Pracheil, Jason A. Deboer, Gene R. Wilde, Kevin L. Pope
Using The Internet To Understand Angler Behavior In The Information Age, Dustin R. Martin, Brenda M. Pracheil, Jason A. Deboer, Gene R. Wilde, Kevin L. Pope
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Declining participation in recreational angling is of great concern to fishery managers because fishing license sales are an important revenue source for protection of aquatic resources. This decline is frequently attributed, in part, to increased societal reliance on electronics. Internet use by anglers is increasing and fishery managers may use the Internet as a unique means to increase angler participation. We examined Internet search behavior using Google Insights for Search, a free online tool that summarizes Google searches from 2004 to 2011 to determine (1) trends in Internet search volume for general fishing-related terms and (2) the relative usefulness of …
Scwds Briefs: Volume 28, Number 3 (October 2012), Jeanenne Brewton, Michael J. Yabsley
Scwds Briefs: Volume 28, Number 3 (October 2012), Jeanenne Brewton, Michael J. Yabsley
Southeastern Cooperative Wildlife Disease Study: Publications
Hemorrhagic Disease 2012 - One for the Record Books?
A Big Year for West Nile Virus
A New Tick-Borne Virus in Missouri?
EEE Virus in 2012
Hantavirus Outbreak – Yosemite National Park
Zebra Virus in Polar Bears
A New Virus in Australian Bats
Documenting Change At Upper Hamburg Bend: Nebraska's First Side-Channel Restoration, Brandon L. Eder, Gerald Mestl
Documenting Change At Upper Hamburg Bend: Nebraska's First Side-Channel Restoration, Brandon L. Eder, Gerald Mestl
Great Plains Research: A Journal of Natural and Social Sciences
In 1996 a side channel was excavated on 629 hectares of former agricultural land at Upper Hamburg Bend on the Missouri River in Otoe County, NE. This was the first side channel constructed on the Missouri River in an attempt to restore lost aquatic habitat. The initial design was for an approximately 4,200 m long side channel to be constructed with a 3 m bottom width. Development ofthe site was to be dependent on flows diverted from the main channel of the river with a final projected top width of 61 m. The side channel was completed in the spring, …
Catching Air - Those Magnificent Jumping Suwannee Sturgeons, Ken Sulak
Catching Air - Those Magnificent Jumping Suwannee Sturgeons, Ken Sulak
United States Geological Survey: Staff Publications
It starts deep at the bottom of the dark silent river, three to four powerful tail beats and three sharp acoustic clicks. Then, a sudden upturn of the body and the fish explodes upward, 100 pounds going vertical, catching air, lots of air. A good jump can power a big fish, six to nine feet into the air. You have to be quick to get a photo, hang time is only about a second, but an accomplished jump by a big old Suwannee River Gulf Sturgeon is impressive; a magnificent display of power. The exit is almost vertical. The tail …
Review Of Conspecific Attraction And Area Sensitivity Of Grassland Birds, David R.W. Bruinsma, Nicola Koper
Review Of Conspecific Attraction And Area Sensitivity Of Grassland Birds, David R.W. Bruinsma, Nicola Koper
Great Plains Research: A Journal of Natural and Social Sciences
Many species of grassland birds are area sensitive, which may exacerbate the ecological effects of the extensive loss and fragmentation of grasslands that has taken place across the northern Great Plains. However, the reasons for this area sensitivity are unclear, as vegetation structure, matrix composition, and restriction of movements among patches do not seem to provide viable explanations for species native to grasslands. Con specific attraction, whereby species are behaviorally stimulated to select habitat or establish territories near individuals of the same species, may help explain this area sensitivity. We review and discuss theoretical and empirical research on avian conspecific …
Reconsidering National Park Interpretation Of The Great Plains And Trans-Mississippi West, Robert Pahre
Reconsidering National Park Interpretation Of The Great Plains And Trans-Mississippi West, Robert Pahre
Great Plains Research: A Journal of Natural and Social Sciences
The National Park Service has generally interpreted its sites in the Great Plains in terms of a Eurocentric narrative of westward expansion. Though some sites are changing (e.g., Little Bighorn), others are not (e.g., Scotts Bluff). Even those sites that have changed still retain important elements of traditional narratives, which often date to the 1930s or to the Mission 66 period (1956-66). The newest sites, such as Washita Battlefield, tell newer stories that resonate well with today's visitors. These provide a model for revising older sites. Giving greater attention to causes and consequences, aiming for a richer mix of disciplinary …
The Geologic Records Of Dust In The Quaternary, Daniel R. Muhs
The Geologic Records Of Dust In The Quaternary, Daniel R. Muhs
United States Geological Survey: Staff Publications
Study of geologic records of dust composition, sources and deposition rates is important for understanding the role of dust in the overall planetary radiation balance, fertilization of organisms in the world’s oceans, nutrient additions to the terrestrial biosphere and soils, and for paleoclimatic reconstructions. Both glacial and non-glacial processes produce fine-grained particles that can be transported by the wind. Geologic records of dust flux occur in a number of depositional archives for sediments: (1) loess deposits; (2) lake sediments; (3) soils; (4) deep-ocean basins; and (5) ice sheets and smaller glaciers. These archives have several characteristics that make them highly …
U.S. Drought Monitor, September 25, 2012, Anthony Artusa
U.S. Drought Monitor, September 25, 2012, Anthony Artusa
United States Agricultural Commodities in Drought Archive
Drought map of U.S. for September 25, 2012 (9/25/12) plus: U.S. crop areas experiencing drought (map), Approximate percentage of crop located in drought, by state (bar graph), Percent of crop area located in drought, past 52 weeks (line graph) for: Corn, Soybeans, Hay, Cattle, Winter wheat.
U.S. Drought Monitor, September 18, 2012, David Simeral
U.S. Drought Monitor, September 18, 2012, David Simeral
United States Agricultural Commodities in Drought Archive
Drought map of U.S. for September 18, 2012 (9/18/12) plus: U.S. crop areas experiencing drought (map), Approximate percentage of crop located in drought, by state (bar graph), Percent of crop area located in drought, past 52 weeks (line graph) for: Corn, Soybeans, Hay, Cattle, Winter wheat.
U.S. Drought Monitor, September 11, 2012, David Simeral
U.S. Drought Monitor, September 11, 2012, David Simeral
United States Agricultural Commodities in Drought Archive
Drought map of U.S. for September 11, 2012 (9/11/12) plus: U.S. crop areas experiencing drought (map), Approximate percentage of crop located in drought, by state (bar graph), Percent of crop area located in drought, past 52 weeks (line graph) for: Corn, Soybeans, Hay, Cattle, Winter wheat.
U.S. Drought Monitor, September 4, 2012, Brian Fuchs
U.S. Drought Monitor, September 4, 2012, Brian Fuchs
United States Agricultural Commodities in Drought Archive
Drought map of U.S. for September 4, 2012 (9/4/12) plus: U.S. crop areas experiencing drought (map), Approximate percentage of crop located in drought, by state (bar graph), Percent of crop area located in drought, past 52 weeks (line graph) for: Corn, Soybeans, Hay, Cattle.
Plains Harvest Mouse (Reithrodontomys Montanus Griseus): Species Conservation Assessment, Melissa J. Panella
Plains Harvest Mouse (Reithrodontomys Montanus Griseus): Species Conservation Assessment, Melissa J. Panella
Nebraska Game and Parks Commission: Publications
The primary goal in development of at-risk species conservation assessments is to compile biological and ecological information that may assist conservation practitioners in making decisions regarding species of interest. The Nebraska Natural Legacy Project recognizes the plains harvest mouse (Reithrodontomys montanus griseus) as a Tier I at-risk species of high conservation need. Some general management recommendations are made here regarding the plains harvest mouse; however, conservation practitioners will need to use professional judgment to make specific management decisions based on objectives, location, and a multitude of variables. This resource was designed to share available knowledge of the plains harvest mouse …
Analytical Modeling Of Irrigation And Land Use Effects On Streamflow In Semi-Arid Conditions: Frenchman Creek, Nebraska, Jonathan P. Traylor
Analytical Modeling Of Irrigation And Land Use Effects On Streamflow In Semi-Arid Conditions: Frenchman Creek, Nebraska, Jonathan P. Traylor
Department of Earth and Atmospheric Sciences: Dissertations, Theses, and Student Research
With proliferation of various numerical models, water budget studies commonly resort to numerical modeling techniques. However, availability and uncertainty in input data limit advantages of this approach. Often, analytical models capture the major traits of the watersheds and can assimilate important data. We developed a model for baseflow-dominated watersheds and apply it to Frenchman Creek in southwestern Nebraska. Frenchman Creek has experienced large streamflow reductions since the 1950s. The cause of these reductions is a combination of irrigation, conservation terrace construction, and other land use changes. However, the influence of each factor has not been well quantified. The objective of …
Topeka Shiner (Notropis Topeka): Species Conservation Assessment, Melissa J. Panella
Topeka Shiner (Notropis Topeka): Species Conservation Assessment, Melissa J. Panella
Nebraska Game and Parks Commission: Publications
The primary goal in development of at-risk species conservation assessments is to compile biological and ecological information that may assist conservation practitioners in making decisions regarding the conservation of species of interest. The Nebraska Natural Legacy Project recognizes the Topeka shiner (Notropis topeka) as a Tier I at-risk species of high priority for conservation. Some general management recommendations are made here regarding Topeka shiners; however, conservation practitioners will need to use professional judgment to make specific management decisions based on objectives, location, and a multitude of variables. This resource was designed to share available knowledge of the Topeka shiner that …
Comparative Transcriptome Analysis Of Two Olive Cultivars In Response To Nacl-Stress, Christos Bazakos, Maria E. Manioudaki, Ioannis Therios, Demetrios Voyiatzis, Dimitris Kafetzopoulos, Tala Awada, Panagiotis Kalaitzis
Comparative Transcriptome Analysis Of Two Olive Cultivars In Response To Nacl-Stress, Christos Bazakos, Maria E. Manioudaki, Ioannis Therios, Demetrios Voyiatzis, Dimitris Kafetzopoulos, Tala Awada, Panagiotis Kalaitzis
School of Natural Resources: Faculty Publications
Background: Olive (Olea europaea L.) cultivation is rapidly expanding and low quality saline water is often used for irrigation. The molecular basis of salt tolerance in olive, though, has not yet been investigated at a system level. In this study a comparative transcriptomics approach was used as a tool to unravel gene regulatory networks underlying salinity response in olive trees by simulating as much as possible olive growing conditions in the field. Specifically, we investigated the genotype-dependent differences in the transcriptome response of two olive cultivars, a salt-tolerant and a salt-sensitive one.
Methodology/Principal Findings: A 135-day long …
U.S. Drought Monitor, August 28, 2012, Brian Fuchs
U.S. Drought Monitor, August 28, 2012, Brian Fuchs
United States Agricultural Commodities in Drought Archive
Drought map of U.S. for August 28, 2012 (8/28/12) plus: U.S. crop areas experiencing drought (map), Approximate percentage of crop located in drought, by state (bar graph), Percent of crop area located in drought, past 52 weeks (line graph) for: Corn, Soybeans, Hay, Cattle.
Flow, Nutrients, And Light Availability Influence Neotropical Epilithon Biomass And Stoichiometry, Tyler J. Kohler, Thomas N. Heatherly Ii, Rana W. El-Sabaawi, Eugenia Zandona, Michael C. Marshall, Alexander S. Flecker, Catherine M. Pringle, David N. Reznick, Steven A. Thomas
Flow, Nutrients, And Light Availability Influence Neotropical Epilithon Biomass And Stoichiometry, Tyler J. Kohler, Thomas N. Heatherly Ii, Rana W. El-Sabaawi, Eugenia Zandona, Michael C. Marshall, Alexander S. Flecker, Catherine M. Pringle, David N. Reznick, Steven A. Thomas
School of Natural Resources: Faculty Publications
Light, nutrient availability, and flow are strong factors controlling the elemental composition and biomass of epilithon in temperate stream ecosystems. However, comparatively little is known about these relationships in tropical streams. We investigated how gradients of light and nutrient availability, seasonality, and habitat influenced epilithon biomass, chlorophyll a, and nutrient ratios in montane streams of Trinidad, West Indies. We sampled 4 focal tributaries of a single river, 2 of which had canopies experimentally thinned, every other month over a 2-y period to observe temporal dynamics and light effects on epilithon. We also sampled 18 sites across Trinidad’s Northern Range Mountains …
U.S. Drought Monitor, August 21, 2012, Michael J. Brewer, Liz Love-Brotak
U.S. Drought Monitor, August 21, 2012, Michael J. Brewer, Liz Love-Brotak
United States Agricultural Commodities in Drought Archive
Drought map of U.S. for August 21, 2012 (8/21/12) plus: U.S. crop areas experiencing drought (map), Approximate percentage of crop located in drought, by state (bar graph), Percent of crop area located in drought, past 52 weeks (line graph) for: Corn, Soybeans, Hay, Cattle.
U.S. Drought Monitor, August 14, 2012, Michael J. Brewer, Liz Love-Brotak
U.S. Drought Monitor, August 14, 2012, Michael J. Brewer, Liz Love-Brotak
United States Agricultural Commodities in Drought Archive
Drought map of U.S. for August 14, 2012 (8/14/12) plus: U.S. crop areas experiencing drought (map), Approximate percentage of crop located in drought, by state (bar graph), Percent of crop area located in drought, past 52 weeks (line graph) for: Corn, Soybeans, Hay, Cattle.
U.S. Drought Monitor, August 7, 2012, Mark D. Svoboda
U.S. Drought Monitor, August 7, 2012, Mark D. Svoboda
United States Agricultural Commodities in Drought Archive
Drought map of U.S. for August 7, 2012 (8/7/2012) plus: U.S. crop areas experiencing drought (map), Approximate percentage of crop located in drought, by state (bar graph), Percent of crop area located in drought, past 52 weeks (line graph) for: Corn, Soybeans, Hay, Cattle.
Role Of The Leguminous Shrub Amorpha Canescens (Leadplant) In The Nebraska Sandhills Grasslands: Water Relations And Patterns Of Water Uptake, Adam Yarina
School of Natural Resources: Dissertations, Theses, and Student Research
This study investigated the ecophysiological role of Amorpha canescens, a leguminous shrub native to the Nebraska Sandhills. Although A. canescens is an important ecological player in the Sandhills, its impacts on the surrounding plant community are poorly understood. To remedy this, two sites were selected for study at the Gudmundsen Sandhills Laboratory near Whitman, Nebraska – one with A. canescens (G-L) and one without A. canescens (G-NL). Both sites contained five representative herbaceous species: two C3 grasses (Hesperostipa comata and Koeleria macrantha), two C4 grasses (Andropogon hallii and Calamovilfa longifolia), and one forb …
Interactions Among Evaporation, Ice Cover, And Water Temperature On Lake Superior: Decadal, Interannual, And Seasonal Variability, Katherine Van Cleave
Interactions Among Evaporation, Ice Cover, And Water Temperature On Lake Superior: Decadal, Interannual, And Seasonal Variability, Katherine Van Cleave
School of Natural Resources: Dissertations, Theses, and Student Research
Lake Superior, the largest freshwater lake in the world by surface area, has enormous impacts on the regional weather and climate. The lake also comprises over half of the total water volume in the Great Lakes system and is an important resource for commercial shipping, water supplies, hydropower, recreation, and aquatic ecosystems. Water temperature and evaporation on Lake Superior have been found to be increasing in recent decades, while ice cover has been decreasing at a very rapid pace. A careful analysis of the long-term trends, however, shows that these changes have not been linear through time. Rather, a step-change …
River Otter (Lontra Canadensis) Home Range, Habitat Use, Overnight Movement, And Survival In The Platte River Of Nebraska, Samuel P. Wilson
River Otter (Lontra Canadensis) Home Range, Habitat Use, Overnight Movement, And Survival In The Platte River Of Nebraska, Samuel P. Wilson
School of Natural Resources: Dissertations, Theses, and Student Research
River otters (Lontra canadensis) are native to Nebraska but were extirpated by the early 1900s. The Nebraska Game and Parks Commission (NGPC) reintroduced river otters during 1986–1991 to restore the species in the state but little is known regarding the habitat needs and status of this high profile threatened species. To provide information for management I conducted research to determine home range, habitat use, overnight movement distance, and annual survival of river otters in the central Platte River of Nebraska.
I trapped, implanted telemetry transmitters, and tracked 18 river otters during 2006–2009. I obtained 996 locations and constructed …